How do I access the error status of a filesystem?

I know how to use fsck. What I want to know is, when you run fsck on a borked filesystem, you immediately see a "filesystem has errors" notification, then it goes on to scan the FS.

I just want a quick way to get access to whatever fsck is looking at to generate that message so I can scan a bunch of servers QUICKLY and see if any need further attention. Google just isn't singing for me tonight....